International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 01 | Jan 2024
p-ISSN: 2395-0072
www.irjet.net
TUNNELING IN HIMALAYAS WITH NATM METHOD: A SPECIAL REFERENCES TO SUNGAL TUNNEL IN JAMMU – POONCH HIGHWAY ALIGNMENT AREAS OF J&K (UT) Vishal verma1, Er. Shilpa Chauhan2 1M.tech Student, Rayat Bahra Univeristy
2Asst.Professor, Rayat Bahra Univeristy, Mohali, India.
--------------------------------------------------------------------------***---------------------------------------------------------------------------Abstract The Sungal Tunnel Work is ongoing Project using NATM method in Jammu Region Falls under Chowkichaura (Akhnoor) and Bhambla (Reasi) of J&K (UT). Based on NATM method the tunnel work became more sophicated, easier and with safety that bears pressure build up by enclosing rock mass and also made sismologically resistant zone. A brief about NATM methods in tunneling in Himalayas zone special with the Sungal tunnel is also discussed in the present paper. Key Words: Sungal Tunnel, NATM, Shotcrete, Mucking, Rock bolting, chowkichaura (Akhnnor), Bhambla (Reasi) J&K (UT).
INTRODUCTION This paper is based on the observations made during the construction of the tunnels in Jammu Akhnoor- Poonch Highway Project (NH-144A Project). The project is in Himalayan range with varying geological conditions the most effective method for tunnel construction seems to be the New Austrian Tunneling Method (NATM) which works on the principle of continuous observations after each execution cycle. Tunneling in the young Himalayan Mountains having challenges due to existing Physical structure like faults and folds, other stratigraphic and tectonic activities. Performing detailed site investigation in this type of area becomes most prerequisite criteria to design a particular tunnel which will facilitate the smooth construction of the tunnel. The Sungal tunnel a highway tunnel under NH-144A constructing in this area. During the construction we use different method to excavate the tunnel. Among all available tunneling construction methods, the New Austrian Tunneling Method is the most suitable method of tunneling construction in such varying unfavorable condition. The ground opening act as load bearing structural component. Drilling and blasting methods are adopted in the excavation of tunnel in NATM technique in rock with the shotcrete and rock bolts used as the main support system (Sauer and Gold 1989). The New Austrian Tunneling Method is flexible to adopt different exaction geometries, large cross section area, change of support system at any time, easy to install etc.
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